<!DOCTYPE html>
<html>
  <head>
    <style>
      *{margin:0px;padding:0px;}
        html,body{
            height:100%;
            margin:0px;
            padding:0px;
        }
    </style>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>homework</title>
  </head>
  <body>
      <div id="app">
          
      </div>
  </body>
</html>
